215 lines
5.3 KiB
C
215 lines
5.3 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: psutils - Parser miscellaneous utilities (Parser only)
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acparser.h"
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#include "amlcode.h"
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#include "acconvert.h"
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME("psutils")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_create_scope_op
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*
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* PARAMETERS: None
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*
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* RETURN: A new Scope object, null on failure
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*
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* DESCRIPTION: Create a Scope and associated namepath op with the root name
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*
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******************************************************************************/
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union acpi_parse_object *acpi_ps_create_scope_op(u8 *aml)
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{
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union acpi_parse_object *scope_op;
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scope_op = acpi_ps_alloc_op(AML_SCOPE_OP, aml);
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if (!scope_op) {
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return (NULL);
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}
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scope_op->named.name = ACPI_ROOT_NAME;
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return (scope_op);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_init_op
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*
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* PARAMETERS: op - A newly allocated Op object
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* opcode - Opcode to store in the Op
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*
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* RETURN: None
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*
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* DESCRIPTION: Initialize a parse (Op) object
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*
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******************************************************************************/
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void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode)
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{
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ACPI_FUNCTION_ENTRY();
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op->common.descriptor_type = ACPI_DESC_TYPE_PARSER;
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op->common.aml_opcode = opcode;
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ACPI_DISASM_ONLY_MEMBERS(acpi_ut_safe_strncpy(op->common.aml_op_name,
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(acpi_ps_get_opcode_info
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(opcode))->name,
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sizeof(op->common.
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aml_op_name)));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_alloc_op
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*
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* PARAMETERS: opcode - Opcode that will be stored in the new Op
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* aml - Address of the opcode
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*
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* RETURN: Pointer to the new Op, null on failure
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*
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* DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
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* opcode. A cache of opcodes is available for the pure
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* GENERIC_OP, since this is by far the most commonly used.
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*
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******************************************************************************/
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union acpi_parse_object *acpi_ps_alloc_op(u16 opcode, u8 *aml)
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{
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union acpi_parse_object *op;
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const struct acpi_opcode_info *op_info;
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u8 flags = ACPI_PARSEOP_GENERIC;
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ACPI_FUNCTION_ENTRY();
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op_info = acpi_ps_get_opcode_info(opcode);
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/* Determine type of parse_op required */
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if (op_info->flags & AML_DEFER) {
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flags = ACPI_PARSEOP_DEFERRED;
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} else if (op_info->flags & AML_NAMED) {
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flags = ACPI_PARSEOP_NAMED_OBJECT;
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} else if (opcode == AML_INT_BYTELIST_OP) {
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flags = ACPI_PARSEOP_BYTELIST;
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}
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/* Allocate the minimum required size object */
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if (flags == ACPI_PARSEOP_GENERIC) {
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/* The generic op (default) is by far the most common (16 to 1) */
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op = acpi_os_acquire_object(acpi_gbl_ps_node_cache);
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} else {
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/* Extended parseop */
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op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);
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}
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/* Initialize the Op */
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if (op) {
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acpi_ps_init_op(op, opcode);
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op->common.aml = aml;
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op->common.flags = flags;
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ASL_CV_CLEAR_OP_COMMENTS(op);
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if (opcode == AML_SCOPE_OP) {
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acpi_gbl_current_scope = op;
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}
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if (acpi_gbl_capture_comments) {
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ASL_CV_TRANSFER_COMMENTS(op);
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}
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}
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return (op);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_free_op
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*
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* PARAMETERS: op - Op to be freed
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*
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* RETURN: None.
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*
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* DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list
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* or actually free it.
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*
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******************************************************************************/
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void acpi_ps_free_op(union acpi_parse_object *op)
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{
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ACPI_FUNCTION_NAME(ps_free_op);
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ASL_CV_CLEAR_OP_COMMENTS(op);
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if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
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ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
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"Free retval op: %p\n", op));
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}
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if (op->common.flags & ACPI_PARSEOP_GENERIC) {
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(void)acpi_os_release_object(acpi_gbl_ps_node_cache, op);
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} else {
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(void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: Utility functions
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*
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* DESCRIPTION: Low level character and object functions
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*
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******************************************************************************/
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/*
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* Is "c" a namestring lead character?
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*/
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u8 acpi_ps_is_leading_char(u32 c)
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{
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return ((u8) (c == '_' || (c >= 'A' && c <= 'Z')));
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}
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/*
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* Get op's name (4-byte name segment) or 0 if unnamed
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*/
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u32 acpi_ps_get_name(union acpi_parse_object * op)
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{
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/* The "generic" object has no name associated with it */
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if (op->common.flags & ACPI_PARSEOP_GENERIC) {
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return (0);
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}
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/* Only the "Extended" parse objects have a name */
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return (op->named.name);
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}
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/*
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* Set op's name
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*/
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void acpi_ps_set_name(union acpi_parse_object *op, u32 name)
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{
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/* The "generic" object has no name associated with it */
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if (op->common.flags & ACPI_PARSEOP_GENERIC) {
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return;
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}
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op->named.name = name;
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}
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